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import React, { useCallback } from 'react';
import { makeStyles } from '@material-ui/core/styles';
import { Poll } from 'which-types';
import { CellMeasurer, CellMeasurerCache, List } from 'react-virtualized';
import PollCard from '../PollCard/PollCard';
interface PropTypes {
polls: Poll[];
mutate: (polls: Poll[], refetch: boolean) => void;
index: number;
style: React.CSSProperties;
cache: CellMeasurerCache;
parent: List;
_key: string; // https://reactjs.org/warnings/special-props.html
}
const useStyles = makeStyles(theme => ({
root: {
paddingBottom: theme.spacing(8)
}
}));
const compareProps = (oldProps: PropTypes, newProps: PropTypes) => {
if (oldProps._key !== newProps._key) return false;
if (oldProps.index !== newProps.index) return false;
if (oldProps.polls !== newProps.polls) return false;
// Only listen for height changes in style
if (oldProps.style.height !== newProps.style.height) return false;
return true;
};
const RenderItem: React.FC<PropTypes> = React.memo(({
polls, mutate, index, style, cache, parent, _key
}) => {
const classes = useStyles();
const poll = polls[index];
const setPoll = useCallback((newPoll: Poll) => {
const newPolls = [...polls];
newPolls[index] = newPoll;
// Force-update list-size so everything re-renders
mutate([], false);
mutate(newPolls, false);
}, [mutate, index, polls]);
return (
<CellMeasurer
cache={cache}
columnIndex={0}
rowIndex={index}
parent={parent}
>
<div key={`${_key}-${poll._id}`} className={classes.root} style={style}>
<PollCard poll={poll} setPoll={setPoll} />
</div>
</CellMeasurer>
);
}, compareProps);
export default RenderItem;
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